Toast the cayenne and dried mustard in a dry pan for 30 seconds before adding liquid ingredients to unlock their full flavor potential and reduce any raw, bitter notes.

Add apple cider vinegar gradually while tasting, as it's the backbone of complexity in this sauce—too little makes it flat, too much overpowers the sweet-spicy balance.

Whisk the light brown sugar with vinegar first to create a paste before combining with other ingredients, ensuring no grainy texture and perfectly smooth sauce consistency.

After combining all ingredients, simmer on low heat for 3-4 minutes to marry flavors together—this short cooking time concentrates the sauce and melds the Worcestershire and mustard notes.

Prepare the sauce up to 3 days ahead and refrigerate; the flavors deepen and mellow beautifully, giving you restaurant-quality depth without last-minute prep stress.